Thank you for taking the time to report this bug and helping to make
Ubuntu better.

Confirmed - I have followed your reproduction steps and hit the same
issue.

The underlying reason however is not in the python3.4 nor mod-wsgi
packages. The issue is that the Docker "ubuntu:trusty" image seems to
include python3.4 version 3.4.3-1ubuntu1~14.04.1 from trusty-proposed
but does not (and should not) have trusty-proposed enabled in
sources.list. When apt later wants to install a matching libpython3.4,
it cannot find it.

So this is a bug in the Docker image, which incorrectly includes
packages from Ubuntu from trusty-proposed. I'll mark this Invalid
against the mod-wsgi and apache2 packages in Ubuntu as there is no fix
to be made in those packages. I'll add a generic Ubuntu task so we don't
forget this issue until I can track down who needs to be fixing the
Docker image.

** Changed in: mod-wsgi (Ubuntu)
       Status: New => Invalid

** Changed in: python3.4 (Ubuntu)
       Status: New => Invalid

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to python3.4 in Ubuntu.
https://bugs.launchpad.net/bugs/1505164

Title:
  python3.4 3.4.3 prevents installation of libapache2-mod-wsgi-py3

Status in mod-wsgi package in Ubuntu:
  Invalid
Status in python3.4 package in Ubuntu:
  Invalid

Bug description:
  Steps to reproduce (using a docker container):

  $ docker pull ubuntu:trusty

  $ docker run --rm -it ubuntu:trusty /bin/bash

  # lsb_release -rd
  Description:  Ubuntu 14.04.3 LTS
  Release:      14.04

  # apt-get update

  # apt-get install python3.4
  python3.4 is already the newest version.

  # python3 --version
  Python 3.4.3

  # dpkg -l python3.4
  ii  python3.4                     3.4.3-1ubuntu1~14.0

  # apt-get install apache2
  ...

  # apt-get install libapache2-mod-wsgi-py3
  The following packages have unmet dependencies:
   libapache2-mod-wsgi-py3 : Depends: libpython3.4 (>= 3.4~b1) but it is not 
going to be installed
  E: Unable to correct problems, you have held broken packages.

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